The emergency rescue of geo-hazards under the conditions of extreme snow and ice disasters is a new challenge faced by government departments. The fast and effective emergency response to geo-hazards in the complicated meteorological environment demands the help of the IT means, in particular the decision support system. Based on the analysis of the characteristics of the emergency rescue of geo-hazards under the conditions of extreme snow and ice disasters, this paper proposes the design thought of the decision support system for emergency rescue of geo-hazards under the conditions of extreme snow and ice disasters. It analyzes the overall objective and functional requirements of the system, and designs the overall architecture, logical structure, integration mode and development environment of the system. Its final aim is to build a spatial decision support system based on a B/S (browser/server) mode and a WebGIS platform that offers the functions of allocating the information of geo-hazard points in the Web environment, performing the stability assessment, hazard assessment and risk decision-making. And the system will generate emergency rescue plans and schemes automatically that can assist leaders to decide and carry on the emergency rescue and rescue work.